If it's RIMFIRE you are after get a CZ 452, 453, or 455. They are half the price and shoot as well or better than the 77/22.
I have an early All-Weather stainless 77/22. I got it back in the early '90s and mounted a Leupy 2x-7x compact rimfire scope in the factory rings. It was, at best, a mediocre shooter with the two or three HP loads it liked. Mainly it served as my "beater" .22 and tin can plinker, and I never cared if it got dropped or rained on.
Every one of my CZ rimfires, from my 26" Ultra Lux to my 16" Scout, has shot worlds better than the Ruger.
About a year ago, when I got my rimfire suppressor, I had my 'smith chop the barrel on the 77/22 to 16.1" and thread it for the can, along with doing a much-needed trigger job. Now it shoots
much better, and although still short of my hyper-accurate CZs, it's become my favorite culling tool for yard squirrels, nocturnal raccoons, and the occasional possum.
One continuing beef is that, in my experience, about only 1 out of every 3 rotary magazines is consistently reliable. The other two will fail intermittently to rotate a round up high enough to chamber just when you need to shoot at something.